I have no idea where to start with this Accounting question.

I have no idea where to start with this Accounting question… My book doesn’t really explain that well…Terando Co. began operations on July 1. It uses a perpetual inventory system. During July, the company had the following purchases and sales.PurchasesDateUnitsUnit CostSales UnitsJuly140$126July632July1156$141July1424July2164$153July2748Calculate the average cost per unit at June 1, 6, 11, 14, 21 & 27. (Round answers to 3 decimal places, e.g. $105.250.)Average cost for each unitJuly1$July 6$July11$July14$July21$July27$Determine the ending inventory under a perpetual inventory system using (1) FIFO, (2) moving-average cost, and (3) LIFO. (Round answers to 0 decimal places, e.g. $2,150.)FIFOMOVING-AVERAGELIFOThe ending inventory under a perpetual inventory system$$$